You have received some good suggestions, IMO.
I agree with trying the Mojo Audio Mystique X SE (R2R DAC) or current equivalent, and the Merason DAC1 MkII (hybrid BB chips). Mojo offers a 45-day trial so you can have an extended trial in your own home/system. Both are musical, but different presentations.
I also agree with considering used gear in good shape from reputable sellers. Manufacturers continue to update digital gear, and buyers continue to upgrade, so there could be solid savings on current models in good conditions. Also, not much to go wrong with a DAC.